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Ministry of Energy Mines and Responsible for Core Review

094K Geological Legend

 

LAYERED ROCKS

MESOZOIC

UPPER CRETACEOUS

SUSTUT GROUP

KK

KOTANEELEE FORMATION: dark grey marine shale, minor sandstone.

KD

DUNVEGAN FORMATION: massive conglomerate, fine to coarse-grained sandstone, carbonaceous shale (marine and non-marine).

CRETACEOUS

FORT ST. JOHN GROUP

KSu

SULLY FORMATION: dark grey marine shale, sideritic (marine, includes Upper Cretaceous beds at top).

KSk

SIKANNI FORMATION: fine-grained grey sandstone, siltstone, shale.

KB

BUCKINGHORSE FORMATION: dark grey marine shale, siltstone, sideritic concretions; minor sandstone (marine).

TRIASSIC

tLu

LUDINGTON FORMATION: dolomitic siltstone, light grey limestone, dark grey limestone.

tL

LIARD FORMATION: orange brown dolomitic and calcareous sandstone, siltstone; minor limestone.

tT

TOAD FORMATION: dark grey calcareous siltstone and shale; minor fine-grained sandstone; minor limestone; includes Grayling Formation.

PALEOZOIC

PERMIAN

FF

FANTASQUE FORMATION: dark grey chert.

FK

KINDLE FORMATION: grey-brown, fine-grained calcareous sandstone, siltstone; dark grey shale; includes Stoddart Formation dark shale, siltstone, sandstone east of Stone Range; may include Prophet Formation (YP).

CARBONIFEROUS to PERMIAN

YP

PROPHET FORMATION: limestone, cherty limestone, chert, dolostone, shale, siltstone (marine).

 

UPPER DEVONIAN

DB

BESA RIVER FORMATION: black, siliceous shale, minor sandstone and pebble conglomerate, barite.

DEVONIAN to MISSISSIPPIAN

EARN GROUP

DYE

Argillite, slate, shale, locally carbonaceous and pyritic; chert arenite and pebble conglomerate, polymictic conglomerate; limestone.

UPPER SILURIAN - MIDDLE DEVONIAN

Du

Undivided Stone (DS), Wokkpash (DW), and Muncho-McConnell (DM) formations.

DD

DUNEDIN FORMATION: medium grey, well-bedded fine-grained limestone; minor calcarenite; rare dolostone (marine).

DS

STONE FORMATION: light grey, very finely crystalline dolostone, dolostone breccia, dolostone, dolomitic quartz sandstone, quartz sandstone, medium to thick bedded ochre.

DW

WOKKPASH FORMATION: yellow weathering fine-grained sandstone, dolostone, siltstone; minor solution breccia.

DM

MUNCHO-McCONNELL FORMATION: medium grey finely crystalline dolostone, sandy dolostone; minor shale and sandstone (marine, may include Upper Silurian beds near base).

LOWER SILURIAN

SN

NONDA FORMATION: dark grey medium crystalline cherty dolostone, sandstone, minor limestone.

ORDOVICIAN - DEVONIAN

ROAD RIVER GROUP

OSD

Undivided shale, black, graptolitic, mainly Ordovician; siltstone, tan, platy, mainly Silurian; sandstone, calcareous shale.

CAMBRIAN - ORDOVICIAN

KECHIKA GROUP

OK

Light grey limestone, argillaceous limestone (marine).

OKg

Graptolitic shale.

OKt

Turbidites.

OKl

Limestone, minor sandstone.

CAMBRIAN

ATAN GROUP

lCA

Undivided limestone, quartzite, sandstone, shale.

Cs

Red weathering coarse conglomerate, sandstone; minor limestone.

UPPER PROTEROZOIC

HADRYNIAN

uBv

Quartz chlorite phyllite, metasandstone, quartz pebble conglomerate.

MIDDLE PROTEROZOIC

HELIKIAN

mBG

GATAGA FORMATION: carbonaceous mudstone, siltstone, sandstone (marine).

mBA

AIDA FORMATION: dolomitic mudstone, siltstone, dolostone; minor chamositic and carbonaceous mudstone, limestone (marine).

mBTu

TUCHODI FORMATION: dolostone, dolomitic siltstone, sandstone, shale.

mBH

HENRY CREEK FORMATION: calcareous mudstone, siltstone, minor sandstone.

mBD

GEORGE FORMATION: limestone, dolostone.

mBTe

TETSA FORMATION: dark grey mudstone, sandstone; minor quartzite.

mBC

CHISCHA FORMATION: dolostone, quartzite; minor siltstone.

 

Geological map and legend adapted from:

Taylor, G.C., and Stott, D.F., 1973, Tuchodi Lakes map-area, British Columbia: Geological Survey of Canada, Memoir 373, 37 pages, 1:125 000.

MacIntyre, D., Legun, A., Bellefontaine, K., and Massey, N., 1995, Geological Compilation, Northeast B.C. (NTS 94A, B, C, F, G, H, I, J, K, N, O, P): B.C. Ministry of Energy, Mines and Petroleum Resources, Open File 1995-6, 1:250 000.

See TUCHODI LAKES (094K) Summary Sheet for an overview of the map area and additional regional references.

Positions of all geological contacts are approximate. In the case of an apparent disagreement between an occurrence’s geological location on the map and its stratigraphic setting given in the MINFILE documentation, the latter should be given priority.